[strong] Implement per-object restrictions behaviour for prototype setting

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index b4dece00ebf60bae9d9e456e466f21910d0067d5..52b01d020dd1a35219664d3d586897b376de6b34 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -12607,6 +12607,13 @@ MaybeHandle<Object> JSObject::SetPrototype(Handle<JSObject> object,
 #endif
 
   Isolate* isolate = object->GetIsolate();
+  // Strong objects may not have their prototype set via __proto__ or
+  // setPrototypeOf.
+  if (from_javascript && object->map()->is_strong()) {
+    THROW_NEW_ERROR(isolate,
+                    NewTypeError(MessageTemplate::kStrongSetProto, object),
+                    Object);
+  }
   Heap* heap = isolate->heap();
   // Silently ignore the change if value is not a JSObject or null.
   // SpiderMonkey behaves this way.